Cytoplasmic Dynein Transports Axonal Microtubules in a Polarity-Sorting Manner.

Cytoplasmic Dynein Transports Axonal Microtubules in a Polarity-Sorting Manner.
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DOI:
10.1016/j.celrep.2017.05.064
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发表时间:
2017-06-13
期刊:
影响因子:
8.8
通讯作者:
Baas PW
Baas PW
中科院分区:
生物学1区
文献类型:
--
作者:
Rao AN;Patil A;Black MM;Craig EM;Myers KA;Yeung HT;Baas PW

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Axonal microtubules are predominantly organized into a plus-end-out pattern.Here, we examined the polarity-sorting mechanism underlying this organization both experimentally and using modeling. The posited mechanism centers on cytoplasmic dynein transporting plus-end-out and minus-end-out microtubules into and out of the axon, respectively. When cytoplasmic dynein was acutely inhibited, the bi-directional transport of microtubules in the axon was disrupted in both directions, after which minus-end-out microtubules accumulated in the axon over time. Computational modeling revealed that dynein-mediated transport of microtubules can establish and preserve a predominantly plus-end-out microtubule pattern as per the details of the experimental findings, but only if a kinesin motor and a static cross-linker protein are also at play. Consistent with the predictions of the model, partial depletion of TRIM46, a protein that cross-links axonal microtubules in a manner that influences their polarity orientation, leads to an increase in microtubule transport. Dynein-based polarity-sorting mechanism for axonal microtubules Rao et al show that the plus-end-out microtubule polarity pattern of the axon can be explained by a polarity-sorting mechanism driven by cytoplasmic dynein together with the participation of other players that include an opposing motor and a cross-linker protein.
细胞质动力蛋白在微管和神经丝的轴突转运中的作用。
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